Most of the Bacteria Involved in Periodontal Disease Are Obligate

Most of the bacteria involved in periodontal disease are obligate (strict) anaerobes.Explain why this is the case.

A) Mouthwashes and toothpaste destroy most of the strict aerobes that are found on teeth.
B) The oral cavity is a low oxygen environment.
C) The crevice between the gingiva and the tooth is low in oxygen.
D) Sugar and other carbohydrates used by the oral bacteria can be more easily consumed anaerobically.